Multifunction synchronization on PCI 6071E

[eLions]

Hi, I got an error on synchronization of two functions with PCI 6071E.  The goal is to update one channel of analog and one channel of digital at the same time and for the same sample size. Please see attached program (DAQmx Configure Code) and its error message. i.e. I tried to utilize either sample clock (AO) or start trigger (AO) for the digital channel but never successful.  Thanks! 

/*********************************************/

// DAQmx Configure Code

/*********************************************/

DAQmxErrChk (DAQmxCreateTask("",&AOtaskHandle));

DAQmxErrChk (DAQmxCreateAOVoltageChan(AOtaskHandle,"Dev2/ao0","",-10.0,10.0,DAQmx_Val_Volts,NULL));

DAQmxErrChk (DAQmxCfgSampClkTiming(AOtaskHandle,"",SampleRate,DAQmx_Val_Rising,DAQmx_Val_FiniteSamps,SampleNumber));

DAQmxErrChk (GetTerminalNameWithDevPrefix(AOtaskHandle,"ao/SampleClock",trigName)); printf("%s\n", trigName);

DAQmxErrChk (DAQmxCreateTask("",&DOtaskHandle));

DAQmxErrChk (DAQmxCreateDOChan(DOtaskHandle,"Dev2/port0/line0","",DAQmx_Val_ChanPerLine));

DAQmxErrChk (DAQmxCfgSampClkTiming(DOtaskHandle,trigName,SampleRate,DAQmx_Val_Rising,DAQmx_Val_FiniteSamps,SampleNumber));

/*********************************************/

// DAQmx Write Code

/*********************************************/

DAQmxErrChk (DAQmxWriteDigitalLines(DOtaskHandle,SampleNumber,0,10.0,DAQmx_Val_GroupByChannel,DOdata,&DOwritten,NULL)); 

DAQmxErrChk (DAQmxWriteAnalogF64(AOtaskHandle,SampleNumber,0,10.0,DAQmx_Val_GroupByChannel,data,&AOwritten,NULL)); 

printf("%d samples written, press any key to start output\n",AOwritten); getchar();

/*********************************************/

// DAQmx Start Code

/*********************************************/

DAQmxErrChk (DAQmxStartTask(DOtaskHandle));

DAQmxErrChk (DAQmxStartTask(AOtaskHandle));

/*********************************************/

// DAQmx Wait Code

/*********************************************/

DAQmxErrChk (DAQmxWaitUntilTaskDone(AOtaskHandle,DAQmx_Val_WaitInfinitely));

[Dennis_Knutson]

What's confusing? As you should know from the specs for your board, it is strictly software timed and using the propert in the error message is not possible.

[eLions]

Yeah, I realized that after the post. Thanks for your information. Originally it was suggested this could be done (http://forums.ni.com/t5/Multifunction-DAQ/6071E-analog-out-and-end-trigger/m-p/1457556). But maybe it worked on other devices, not for 6071E. Anyway, I am happy to find for asynchronized DO-AO the delay in our tests is only 1ms, which is good enough.